Shear press



`,une 2l, 1949. R, F; DEHN 2,473,942

SHEAR PRESS Filed Deo. 22, 1945 4 Sheets- Sheet 1 INVENToR. Il 2 mf L kl L 2g BY Pay F. @ff/H mw. wm.

R. F. DEHN SHEAR PRESS l I Ill June 21, 1949.

Filed Dec. 22, 1945 June 21, 1949.

R. F. DEHN SHEAR PRESS 4 Sheets-Sheet 3 Filed Dec. 22, 1945 H6' 5- INVENTOR.

R. F. DEHN SHEAR PRESSA June 21, 1949.

4 Sheets-Sheet 4 Filed Dec. 22, 1945 INVENTOR. /Pov E DEHN ,gw MWwWM/M Patented June 21, 1949 SHEAR PRESS Roy F. Dehn, Cleveland, Ohio, assgf'nor to The Cleveland Crane & Engineering Company, Wickliffe, Ohio, a corporation of Ohio Application December 22, F9415, -Sv'er'ial No. $36,899

(Cl. NPL-'43) 6 Claims.

The present invention relates to power-operated, heavy duty shears and, more particularly, to the lmea-ns vfor adjusting the clearance between the shearing knives thereof.

The clearance between the shearing knives of heavy duty shears lof the general type employed in shops engaged in fabricating metal plates and the like must be changed for each different gauge or thickness of material to be sheared. The various constructions heretofore employed for accomplishing the aforesaid adjustment have been unsatisfactory for one reason or another. With the foregoing in mind, the principal object of the present invention is the provision of a novel and improved, power-operated, heavy duty shears of the character referred to having an oscillating upper leaf and improved means for vconveniently adjusting the clearance between the shearing knives, which means is simple in construction, reliable in operation, and convenient to operate.

The invention resides in certain constructions and combinations and arrangements of parts, and further objects and advantages will be apparent to those skilled in the art to which it relates from the following description of the preferred embodiment described With reference to the accompanying drawings formi-ng a part of this specification in which similar reference characters designate corresponding parts throught out the several views, and in which Fig. 1 is a front elevational View of a poweroperated, heavy duty shears embodying the present invention;

Fig. 2 is a rear View of the shears shown in Fig. 1;

Fig. 3 is an end view of the shears shown, looking from the right of Fig. 1;

Fig, 4 is a fragmentary sectional view, Withportions in elevation, approxi-mately on the line 4-4 of Fig. 3;

Fig. 5 is a fragmentary sectional view approximately on the line 5=-5 of Fig. 1;

Fig. 6 is an enlarged fragmentary elevational View, with parts broken away, of a portion of i Fig. 3;

Fig. 7 is a sectional View, with portions in elevation, approximately on the line 1-1 of Fig. 6; and

Fig. 8 is a sectional View, with parts in 'elevation, approximately on the line 8-8 of Fig. 6.

The shears shown herein are similar to the shears shown 'and described in a lc'opending application of William G. Wehr, Serial No. 532,078, filed April 21, 1944, upon which U. S. Patent No. 2,397,896, issued-fon lApril i2., 1946, an'd only those parts j'of the shears which 'are necessary to a compl-ete understanding of the present invention are herein shown and 'described 4indeL tail. Reference to the aforesaid application is made for a complete f'showing 'anddescriptibn of those parts "of the shears not ."fully 'shown and described herein.

Referring to the drawings, the reference ch'ar- Aa'cter A designates a frame comprising stressresisting, plate-like `Ien'd members or side housings iii, `fH havingnaligne'd 'openings l2, I3, respectively, in the-infront edges; a crown I'4; Iand a bed comprising plate-like members 15 t6 and ii, the latter of which forms a 4'scrap chute. The vertical ,plate-like member l5 iis located immediately to the rear of and `is welded to 'the horizontal plate-like memb'er i6., which mem- -b'er in addition to reinforcing the upper edge of the member 15, forms a support or work table Vfor vthe work. The upper member 'or vcrown I4 is generally box-shaped in 'cross-section Iand has its opposite 'ends welded to the 'side rh'o'usings lil, 4Il ladjacent to their front upper edges. Web members 20, -QI and 22 welded to the in'- -terior of the member i4 reinforce the same and the lower ends of the members 20, 2| `which extend bel-ow the rear side of the member Il 'or supports for suitable bearings within which a crankshaft 23 is rotatably supported.

The shearing `operation is .performed by fa fstationary vslriearing knife 24 located in 'a cutou't portion at the -uppe'r rear 'cornerfof the bed and a movable shearing knife 25 connected to the lower front edge of a movable ram or blade, 'designated generally by thereferenc'e 'character B. The lamovabie ram or upper blade B, which lextends substantially from one side housing to the other, is of built-up construction and comprises a `longitudinally extending front plate 26 welded to the frontends of rearwardly extending end members 21, 28, the rear ends of Which are rotatably `c-:onr'iected to short shaft=like menibers 3B, 3i rotatably supported in suitable apertures in the side housings Hl, H, respectively, for rotation about an 'axis a 'eccentric to th'e axis b about which the end members 21, 28 are connected thereto. The axis -a about which the ram vor blade B is pivoted -is preferably slightly above the plane of the Work supporting surface of the bed.

The front plate 2B o'f the blade B is inclined at a slight angle to the vertical, clearly shown in Fig. 3., to provide clearance between the` ram or blade B and the stafibiiiy shearing kf when the blade is moved in a downward direction. The lower front edge of the plate 26 is cut out so as to receive the upper shearing knife 25, which knife is held in position therein by a plurality of screws 29 projecting therethrough and threaded into suitably tapped apertures adjacent to the lower edge of the plate 26. The heads of the screws 29 are located in a groove in the front face of the shearing knife and are counter-sunk so as not to interfere with the oscillation of the movable blade B. The lower edge of the plate 26 is inclined lengthwise so that the knives will effect a true shearing action.

The front end of the ram or movable blade B is supported and the entire blade assembly is adapted to be oscillated about the shafts 30, 3| by pitrnans 32, 33, the upper ends of which are operatively connected to eccentrics 34 on the crankshaft 23 and the lower ends of the pitmans to short shafts 35, 36 fixed in opposite ends of the blade B. The construction, including the location of the crankshaft 23 and the shafts 35, 36 with respect to the knives, is preferably such that the resultant of the shearing forces passes susbtantially through the centerlines of the pitmans or connecting rods 32, 33, with the result that very little load is carried by the shafts or pivots 30, 3|.

The crankshaft Z3 is rotated to reciprocate the movable ram or blade B by an electric motor 3l adustably secured to the back of the crown I4 and operatively connected to the crankshaft by means including a friction clutch and brake operated in such a manner that when the treadle 38 is depressed and immediately released, the crankshaft makes one complete revolution but willcontinue to rotate as long as the foot pedal is depressed. As shown, the weight of the movable blade B is counterbalanced by adjustable compression springs, one at either end of the ram, located within tubular housings 4|, 42 xed t0 the crown member I4.

According to the provisions of the present invention, the shafts 30, 3| can be simultaneously rotated about their axes a so as to change or vary the clearance between the shearing knives 24, 25. For this purpose the shafts 30, 3| are provided with gear sectors 45, 46, respectively, keyed thereto immediately inside of the side housings I0, Il. The gear segments 45, 46 are continuously in mesh with pinion gears 41, 48 formed integral with a transversely extending shaft 56 rotatably supported in suitable apertures in the side housings I0, Il. Either or both ends of the shaft D may extend beyond the side housings where provision can be made for rotating the same. As shown, the right-hand end of the shaft 58 extends beyond the side housing I0 where it is provided with a hand crank '5| for rotating the same. An adjustable zero clearance stop in the form of a screw 52 threaded into a member 53 welded onto the inside of the side housing i0 prevents moving the gear sector 45 until the knives strike against each other. The screw 52 is provided with a jam nut for securing it in any adjusted position.

Provision is also made for locking the shaft 50 against rotation during operation of the press in the form of a member 55 bolted to the outside of the side housing I 0 and having an aperture through which the shaft 50 extends. The member '55 has a split 56 opening into the lower side which extends to the aperture through which the shaft 50 projects. The lower ends 51, 58 of the member 55 are adapted to be moved toward each other to clamp the shaft 58 against rotation by a member 68 threaded into a suitably tapped aperture in the end 5'! and projecting through an aperture in the end 58. A collar 6| on the member 68 forms a shoulder which abuts against the side of the member '55 to draw the ends 57, 58 thereof together upon rotation of the member 60 in the right-hand direction. Rotation of the member 68 in the opposite direction allows the ends 57, 58 to spring apart and release the shaft 50.

If desired, the mechanism for operating the shaft 5U can be extended to the front of the machine either above or below the work table so that the knife clearance can be adjusted without going around to the side of the shears.

The shears shown also include a plurality of spring-loaded, hold-down devices 62 detachably bolted to the lower edge of a hold-down plate 63 suspended from the forward arms of bell crank levers 68, 65 pivotally connected -to the plates 20, 2|, the rear arms of which levers are provided with rollers adapted to engage cams 66 on the crankshaft 23. The levers 64, 65 are continuously urged in a clockwise direction, as viewed in Fig. 3, to engage the rollers thereon with the cams 66 by suitable compression springs 61 interposed therebetween and the top of the crown member i4. The lower part of the hold-down plate 63 is connected to the side housings ID, by links 68, one at either side of the hold-down plate, which links are pivotally connected to the hold-down plate and to the side housings l0, Il.

Preferably the shear is provided with means for indicating the clearance between the shearing knives at all times. In the shear shown, the setting of the upper shearing knife 25 with respect to the lower knife Z4 is indicated by a pointer 80 operatively connected to the right-hand shaft or pivot 38 for the blade B. The upper end of the pointer 88 cooperates with and moves over a scale, designated generally by the reference character 8|, graduated both in plate sizes and thousandths of an inch clearance between the shearing knives. The pointer 8B is pivoted below the center of the pivot 30, as by a pinv 82, to an annular boss 83 welded to .a plate 84 detachably connected as by studs 85 and nuts 66 to a boss 8l on the side housing l@ surrounding the shaft or pivot 30. The scale 8| is formed upon a sheet metal member 88 located above the pivot 30 and secured to the plate 84 as by screws 89.

The pointer 8i) is operatively connected to the pivot 36 by mechanism including a generally horizontal member 96. The right-hand end of the member Q8, as viewed in Figs. 6 and 7, is provided with an integral boss 9| and is pivotally connected as by a screw 32 to the shaft or pivot 36 eccentric with respect to its axis of rotation a. The plate 84 has a centrally located circular hole 93 through which the boss 9| and screw 92 project. The left-hand end of the member 96 is slidably supported in a member 98 rotatably supported in the plate 8d and a boss 95 welded to vthe plate 68. The member 95 is operatively connected to the pointer 88 by a link 96 pivotally connected'to a member 97 adjustably connected to the member 98 for movement lengthwise therealong by the setscrew 98 which'also forms the pivot for the link 96. The right-hand end of the link 96 ispivotally connected by a pin E66 to the pointer 86 above its pivotal connection with the boss 83.

The construction of the pointer actuating mechanism is such thatrotation of the pivot or shaft 3D reciprocates the member 90, which in turn moves the link 96 causing the pointer 89 to rotate about its pivot 82. The link 96 is pivotally connected to the pointer 80 adjacent to its lower end so that a relatively small movement of the shaft 30 produces a relatively large movement of the pointer 80. The indicating mechanism just described is enclosed within a removable cover plate IUI of substantially the same size and shape as the plate 84 and spaced therefrom by an annular ange or ring m2 welded to the member 84. The cover plate lill has an opening or window |03 in the upper part thereof through which the upper end of the pointer 8i! and the scale 8| is visible. The opening U33 is provided with a glass or transparent member illwhich prevents the entrance of dirt into the dial mechanism. Nuts |05 threaded onto the projecting ends of the studs 85 hold the cover plate il in position. provides means for resetting the pointer 3Q to zero upon regrinding of the knives, etc. The knife clearance indicating means may be con nected to either of the shafts 3U, 3| or 5l) and may be extended by a Bowden wire or similar mechanism to the front of the shears, in which event the indicating means proper may be iocated either above or below the work table.

From the foregoing it will be apparent that the objects of the invention heretofore enumern ated and others have been accomplished and that there has been provided a novel and improved shears of the character referred to comn prising improved simple means for adjusting the clearance between the shearing knives. While the preferred embodiment of the invention has been described in considerable detail, I do not wish to be limited to the particular construction shown which may be varied within the scope of this invention, and it is my intention to hereby cover all adaptations, modifications and uses thereof which come within the practice of those skilled in the art to which the invention relates and within the scope of the appended claims.

Having thus described my invention, I claim: 1 In a power operated, heavy duty, metal shears of the character referred to, the combination of: a frame comprising horizontally spaced, generally vertical side housings and a bed having a generally horizontal surface, adapted to support material or work to be sheared, con-- nected to said side housings adjacent to the front thereof; said bed being adapted to have a shearing knife detachably connected thereto adjacent to its upper rear edge; a movable ram or blade intermediate said side housings and ek tending substantially the entire distance there-` between; means including a plurality of shaftsy mounted in said side housings; said shafts each having an eccentric portion for pivotally supporting said movable ram or blade for movement about an axis generally parallel with the upper rear edge of said bed; said movable ram or blade having its lower front edge adapted to have a shearing knife detachably attached thereto; a plurality of gear-like members, one nxedly connected to each of said shafts intermediate the side housing within which the respective shaft is supported and the adjacent side of the ram or blade; a plurality of pinion gears, one in mesh with each of said gear-like members; means for simultaneously rotating said pinion gears for varying the clearance between the shearing knives; and power actuated means pivotally connected to said ram or blade ad- The setscrew 93 L jacent to" the front thereof for oscillating said ram or blade 'about said axis to cause a cutting edge of the shearing knife carried thereby t0 move across cutting edge of the shearing knife carried by said bed. in a vpower operated, heavy duty, metal shears, of the character referred to, the combination of: frame comprising horizontally spaced, general' vertical side housings and a '10 bed havingr a generally horizontal surface, adapted to support material or work to be sheared, connected to side housings adjacent to the front thereof; said bed being adapted to have nii@ detachably connected thereto,

upper rear edge; a movable ram i 'ermcdiate said side housings and extending stantially the entire distance therebetween; means including a plurality of shafts supported by said :de housings; said shafts each Jntric portion for pivotally sup- .ible or blade for movement Vrally parallel with the upper u; said movable ram or blade nt edge adapted to have a t fhably attached thereto; a l'ke members, one xedly consaid shafts intermediate the in which the respective shaft the adjacent side of the ram ,ft rotatably supported by said extending therebetween; a p lion gears on said shaft, one in each of said gear-like members; ror rotating said shaft for varying the the shearing knives; and

ram or blade about said axis De of the shearing knife caracross a cutting edge of the she mg e carried by said bed.

3. In a power operated, heavy duty, metal shears of the character referred to, the combination of: a frame comprising horizontally spaced,

t generally vertical side housings and a bed having a generally horizontal surface, adapted to support material or work to be sheared, connected to said side housings adjacent to the front thereof; said bed being adapted to have a shearing knife detachabiy coiuiected thereto adjacent to its upper rear movable ram or blade intermediate said side housings and extending substantially the entire distance therebetween; means including a plurality of shafts mounted in said side housas ings; said shafts each having an eccentric portion for pivotally supporting said movable ram or blade for movement about an axis generally parallel with the upper rear edge of said bed; said movable ram or blade having its lower front edge adapted to have a shearing knife detachably attached thereto; a plurality of gear-like members, one ixedly connected to each of said shafts; a plurality of pinion gears, one in mesh with each of said gear-like members; means for simultaneously g5 rotating said pinion gears for varying the clearance between the shearing knives; means for indicating the clearance between the shearing knives; and power actuated means pivotally connected to said ram or blade adjacent to the front 7g thereof for oscillating said ram or blade about said axis to cause a cutting edge of the shearing knife carried thereby to move across a cutting edge of the shearing knife carried by said bed.

Li. In a power operated, heavy duty, metal 75 shears of the character referred to, the combinato cause er u tion off? lanfranie'comprising horizontallivsspaced; generally vertical sidehousingsand embed having aggenerally horizontal,surfaeefadaptedto suppnrt material or.. work-tobe-fshearemlconnectedatofsaid side housings adjacent to the irontvthereefi: l.said bed-.sbeing adapted I,to vnavega:shearing Aknife .detachablyzconnected thereto. yadjacent :to its .upper rearfedge'; a movable ram 4orlziladeV intermediate said side :housings and extendingsubstantiallyfthe entiredistance therebetween: meansdneludngfa plurality of shafts supported bvr'said..-side'xhullsing;. said shaftseach having amaeeceritrie. portion-for.- pivotally lsupportingy saidrmovable framflorblade formovement about .an axis i generallyvparallel with the upper rear-edge offsaidibedisald movable, ram or blade having its lower;frontzed'geiadapted toy have a .shearing knife fdetachably attached. thereto; a Apluralityfrof'gearalikesmembers; one xedly connected tok each of'rsaivrlashaitsfinter-l mediate.` the side housing' 'withinx which. the.y re@` spective shaft is supported and the Vadjacentiside ofthe ram or blade; a shaft rotatably-supportedav by-said. side housings and extendingtherebetween; al plurality of pinion .gears on isaldi/shaft, one in meshvwith eachy of said=gearlike members; means for, rotating. said sh'aftfor varying-.the:clearance between the shearing-1knives; means'=-including-fa scale.: and a cooperating .relatively long-pointer operatively connected tosaid frame an-d' said shaft' atf'two `relatively closely spaced ipoints .remote fromthe end of the vpointeradjacenttofthescalefor indicating the clearancebetween; the shearing knives; and power actuated means -pivotally connected to said ram or Vbladeadj'aeent :tothe front thereof for oscillatingsaidl ramer-blade about said axis to cause a cutting edge oftheshearl-ng.

knife carried therebyy tomove -across #abutting edge of the shearing-knife carrieelb'yvsaidbed.E

5 f-In a power operated, heavy'dut-y,v metal4 shears of thecharacter referredftoftheeombination of: a frame yconlprisin-g horizontally spaced,A

generallyvertical side housings and afbed having a generally horizontal sur-face, adaptedrto'support1 material or work to be--shearedfconnectedto said side housings adjacent 'to lthe front thereof; said bed Abeing adapted -to have a shearlngfknife rde tachably connected thereto adjacent-'to fitsfupper rearf edge g a 4movable ram or 4blarle intermediate said lside housings and'-extendingfrsubstantiallyi the Rentire-distance-therebetween 'safidvmovable ram or blade having its lower-front edgeadapted to havefashearing knfe--detachably; attachedf thereto means for pivotallysupportlng -said'mow able -f ram -v or blade for movementabout anfaxis generally parallel with-- the v`upperrear -fedge-ofg said 'bed; said means' including-ashafthavingra;

pluralitysofs:portionszaeccentrie withirespet to eaclr-otherconnected to said frameg'andfsaidfram; respectively; means forirotating.;:1sad.: shait. for varyingxthe clearance fibetweengzshearing;knives carried byfsaidwbedand said'ram.: meansiineluding a scale andra:cooperatingerelativel-y longripointel: operatively connected to-saidrframe andsaidzshaft at two vlrelativelylosely"spacedfpointsi-remote from the' end: y'of the :pointer adjacent -ato-zthe =scale ifer indicating the xclearance? between a" the shearing knives; andfpowerrlactuated: means pivotallsi I'con-i nectedfto said-ram adjacentftoithefifront thereof for-f oscillating..fsaid: ram. about lsaidfaiiisto/:cause arcuttingedge ofthe shearing knife xcarried:there:i by tol move .by ar. cuttingifedgef. of `the @shearing knifecarried'1iby said bed.`

6.- In zaf power .Y operated; heavyrduty;v metal shears `ofz .the lcharacter referred.'V toetheicombinaa tion of; a frame Ycomprising horizontallyfspaced; generally vertical side-shousings :and: arbe'd-:having a generally -horizontalsurfaca adapted ;.to.suppont materialv or ,worktolb'e shearedg'f'connected to said side housings adjacent `to the :front fthereof said bed being..` adapted to.y -haveua fshearing knife l:idee tachably vconnectedrthereto adj acent .to its 1 upper rear edge; a..movable ramforbladezintermediate: said :side housingsA andA 'extending substantiallyv the entirev .distance-therebetween; said'` movable ram? or: blade'having its lowerffront ledge' adapted tov-.have a shearing knife v'detachably .2 attached thereto; means `forpli/Totally'supporting said move able ram or` blade!forimovementsaboutxan axis generallyparallel withtheupper rear, edge of. 'said bed; said: means includingaushaftv having .axzplua rality of i portions eccentric. with `respect 1toe-each other.. connectedf. to. said.` frame. I andK saidffram; respectively a.. gearielike member. fixedly cannected lto saidnshatt'; agear'. ini-:meshzwith said gear-like member ;l means forl rotatingfsaidfgear for.r varying the clearance. between: shearingy knives carried` by' saidVI bed y fand. said ram;` means including a scale .and .a'cooperat'ing relatively :long

pointer operatively :connected .to lsaidriramesancl said vshaft .at two Arelatively-clo'se-ly .spaced points remote from thev'end` of =th`e. pointer adjacent'to the :scalelfor indicatingv theelearance -fbetween'the shearing knivres; and power actuatedgmans pivotally connectedrto said adjacent 'to the :front thereofffor;l oscillatingcsaidfram: .about saldraxis. to. cause-la cuttingredgevofsthe shea-ning knife carried.. thereby -to move .f by a. cutting edge 'of .the shearing knife icarried. by'sai'cl bed:

ROYLFrDEI-m'.'

No references cited. 

